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在建立受非均布线形荷载作用的地基力学模型的基础上,应用叠加原理推导出地基表面在非均布的线形荷载作用下,预应力锚索-地梁结构中垂直于梁轴线平面内的地基中深处的应力和位移计算公式,为研究预应力锚索-地梁结构在岩体中的传力规律提供了理论基础。以湖南省常张高速公路K123+160～K123+369边坡为试验区域,通过理论分析得出,在对锚索施加预应力后,锚索预应力通过地梁传递给被加固的岩土体,其传递方式在垂直于地梁轴线的平面内是以梁轴线与该平面的交点为端点的近似椭圆的等值面形式由内向外呈逐渐衰减趋势分布的。现场试验得出,两地梁周边岩体中的压应变随深度增加由小到大增至峰值,然后逐渐衰减为0,这种分布形式与理论结论一致。
On the basis of establishing the foundation mechanical model which is affected by the non-uniform wiring load, the superposition principle is used to deduce that under the non-uniform linear load, the prestressed anchor-ground beam structure is perpendicular to the plane of the beam axis The calculation formulas of stress and displacement in the deep foundation provide theoretical basis for studying the law of force transmission in prestressed cable-ground girder structure. Taking the K123 + 160 ~ K123 + 369 slope of Chang-Zhang expressway in Hunan Province as the test area, the theoretical analysis shows that after the prestressing is applied to the anchor cable, the prestressing force of the anchor cable is transmitted to the reinforced rock mass through the ground beam , The transmission of which is perpendicular to the axis of the ground beam in the form of isosceles of the approximate ellipse with the intersection of the beam axis and the plane as the gradual attenuation trend from the inside to the outside. Field tests show that the compressive strain in the rock masses around the two beams increases from small to large to peak value, and then gradually decays to 0, which is consistent with the theoretical conclusion.